On Thu, Dec 29, 2016 at 02:03:04PM +0100, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@xxxxxxxxxx>
>
> Some LEDs can be related to particular USB ports (common case for home
> routers). This property allows describing such a relation.
>
> Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
> ---
> This patch is based on top of commit 52e847dc431 ("DT: leds: Improve examples
> by adding some context") sitting in the linux-leds.git (for-4.11).
> ---
> Documentation/devicetree/bindings/leds/common.txt | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
> index 24b6560..fcfe661 100644
> --- a/Documentation/devicetree/bindings/leds/common.txt
> +++ b/Documentation/devicetree/bindings/leds/common.txt
> @@ -49,6 +49,14 @@ Optional properties for child nodes:
> - panic-indicator : This property specifies that the LED should be used,
> if at all possible, as a panic indicator.
>
> +- usb-ports : List of USB ports related to this LED. Some devices have LEDs that
> + should be used to indicate USB device activity. This can be
> + described with this property.
> + There can be more than one LED like this, e.g. some vendors use
> + one controller per USB version. It's then common to use different
> + color LEDs depending on device USB standard (like USB 2.0 vs.
> + USB 3.0).
I don't like this being USB specific. Either we should have a generic
way to link triggers to other DT nodes or the existing trigger property
should be used (and be capable of listing more than 1 port). I'd prefer
the latter as I don't think we need another way to specify triggers.
> +
> Required properties for flash LED child nodes:
> - flash-max-microamp : Maximum flash LED supply current in microamperes.
> - flash-max-timeout-us : Maximum timeout in microseconds after which the flash
> @@ -69,6 +77,11 @@ gpio-leds {
> linux,default-trigger = "heartbeat";
> gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
> };
> +
> + usb {
> + gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
> + usb-ports = <&ohci_port1>, <&ehci_port1>;
> + };
> };
>
> max77693-led {
> --
> 2.10.1
>
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